Carpenter believes that when Waller turns his vast and talented team of racehorses on this year's Melbourne spring carnival he will have "an instant but at the same time sustained impact" on some of Australia's most important races.

As nominations were released on Monday for Saturday's two critical meetings in Sydney and Melbourne, Waller's influence was again emphatic. And it appears not for the first time that he will be a major stumbling block to all rival stables with his sheer number of runners in both states this weekend.

To highlight the Rosehill trainer's potential dominance, he has nine of the 17 entries for the group 3 Craven Plate at Randwick. In Melbourne, he has nominated six horses for the spring shaping, group 1 Turnbull Stakes at Flemington.

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Even though the Turnbull is shaping as a tough race to earn a start in after 28 nominations were received - the field is limited to 16 starters - all of Waller's entrants would have little trouble gaining a start if he decided to run them.

Waller has entered 13 horses in the group 1 Epsom Handicap at Randwick and a staggering 21 stayers for one of Sydney's flagship distance events, the Metropolitan.

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Waller's influence in the weekend's majors will be strong in quality as well as quantity. In the Epsom he is likely to run Boban, Royal Descent, He's Your Man and Lucky Chappy. In the Metropolitan his expected runners are Junoob, Bagman, Opinion, Brigantin, and Our Voodoo Prince. In the Turnbull, Hawkspur and Who Shot Thebarman.

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His other spring hopefuls will wait for the following week at Caulfield.

"He has an extraordinary amount of horses and I must say a very high number of those are gifted and quality racehorses," Carpenter said. "One suspects if he put them all into one race, he would be extremely hard to beat."

But Waller maintained that even before his amazing rise to be Australia's most influential trainer, he had an unshakeable belief that you couldn't just turn up in Melbourne with any horse for the carnival, you had to have the right horse or you were "wasting your time".

"Over the years I've gradually built up my numbers for Melbourne, firstly in a trickle then more and more. It's one of the most difficult carnivals to win at - you have to have a very good horse to be worthy of competing," he said.

Waller's impact and weight of numbers have been so great in Sydney that he regularly saddles up half the field in some races.

"It is obviously an extremely well-run outfit," Carpenter said. "Chris Waller will, of course, have great numbers during the spring, but to counter that he will be up against a greater spread of trainers in Melbourne.

"He has a very well-structured business. Invariably his racing manager will contact Racing Victoria if they have queries on the conditions of certain races they hope to bring horses across the border to Melbourne for.

"In my time, a trainer hasn't gathered such a huge number of racehorses, with those numbers to translate into so many winners."